<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>表格</title>
</head>
<body>
    <h1>表格</h1>
    <table border="1">
    <tr>
        <td rowspan="2">2,1</td>
        <th colspan="2">1,3</th>
        <th rowspan="3" colspan="2">3,5</th>
    </tr>
    <tr>
        <th>2,2</th>
        <th>2,3</th>
    </tr>
    <th rowspan="2">4,1</th>
    <th>3,1</th>
    <th>3,3</th>
    <tr>
        <th>4,2</th>
        <th>4,3</th>
        <th>4,4</th>
    </tr>
</table>
</body>
</html>